System description:
The wireless transmission system of dense one-way mark-up image is a real-time transmission system of broadcast-level mark-up image produced by our company. With the current leading COFM modulation technology, it has relatively narrow air bandwidth (8MHz) and strong anti-multipath interference ability. Combining with advanced diversity reception technology abroad, it overcomes the difficulties caused by multi-path reflection and occlusion in image transmission under the conditions of analog technology and conventional modulation technology, and achieves high-speed motion or non-line-of-sight conditions. It can still transmit high quality standard image in real time, especially suitable for use in complex environment. Audio and video coding adopts the standard of MPEG-2, which has the characteristics of clear picture quality, bright color and smooth image.
System features:
Anti-EMI Performance of COFDM
It has excellent performance against frequency selective fading or narrowband interference and interference between signal waveforms. It has strong anti-fading ability through the joint coding of various subcarriers. In single carrier systems (e.g. digital microwave, spread spectrum microwave, etc.), a single fading or interference can lead to the failure of the entire communication link, but in multi-carrier COFDM systems, only a small part of the subcarriers will be interfered, and these subchannels can also use error-correcting codes to correct errors to ensure the transmission of low error codes. Rate.
Anti-multipath fading performance of COFDM
It can effectively counteract the interference between signal waveforms and is suitable for high-speed data transmission in multipath environment and fading channel. When frequency selective fading occurs in the channel due to multipath transmission, only the subcarriers falling in the frequency band depression and the information they carry are affected, and the other subcarriers are not damaged, so the overall BER performance of the system is much better.
System advantages:
& The working frequency band can be customized from 300 MHz to 860 MHz.
& Middot; MPEG-2 video coding and decoding;
& Middot; end-to-end delay is 300 milliseconds;
& Middot; stable image transmission under high-speed mobile and multi-path interference;
& Middot; powerful NLOS non-line-of-sight transmission capability;
& Middot; 1-2W transmission power customized;
& Middot; long transmission distance (2W encrypted transmitter, ground-to-ground non-line-of-sight transmission 1-2 km, ground-to-ground line-of-sight transmission 2-3 km, ground-to-air transmission 3-5 km);
& Middot; with spatial diversity receiving capability;
& Middot; dual antenna reception, signal stability, image smoothness;
& Middot; Small size, light weight, easy to install and use.
System application:
It can be used in public security, fire fighting, traffic police, civil air defense emergency, urban management law enforcement, environmental protection monitoring, three prevention emergency, water conservancy flood control, electric power emergency, railway emergency, maritime law enforcement, maritime inspection, customs border control, wharf monitoring, forest fire prevention, oil field anti-theft, military reconnaissance, television broadcasting, etc. Real-time mobile transmission of high-quality images in complex environments such as terrestrial environment.
System application form:
It is mainly used in the scene of single soldier video return or UAV video return. The front-end transmitter transmits the field-marked video signal to the handheld receiver and displays the video image for real-time monitoring.
Transmitter product characteristics:
U image quality is high, the image is clear and stable, and there is no tail phenomenon.
U power is stable and 19-33 dBm dynamic power is adjustable.
U has strong diffraction ability and supports non-line-of-sight transmission.
U is stable by using COFDM modulation technology and MPEG-2 image compression technology.
U has small volume, good heat dissipation and working temperature less than 45 C.
U equipment battery disassembly is convenient and fast; (this structure and function design has applied for utility model patent)
High integration of equipment, intelligent settings, simple operation.
